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Mergers and Acquisitions- CSFL (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 07, 2020 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares | Dec. 31, 2019 USD ($)
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |
Goodwill |  | $ 1,566,524,000 | $ 1,002,900,000 | $ 1,566,524,000 | $ 1,002,900,000 | $ 1,002,900,000
Additional information |  |  |  |  |  |
Reversal of CSFL's ending allowance for credit losses |  | 4,642,000 | 2,779,000 | 10,296,000 | 7,260,000 |
Proforma amounts |  |  |  |  |  |
Total revenues (net interest income plus noninterest income), Pro Forma |  |  | 361,287,000 | 1,151,361,000 | 1,009,372,000 |
Net interest income |  |  | 275,217,000 | 788,031,000 | 786,383,000 |
Net adjusted income available to the common shareholder |  |  | $ 113,008,000 | $ 300,248,000 | $ 301,898,000 |
EPS - basic | $ / shares |  |  | $ 1.56 | $ 4.23 | $ 4.30 |
EPS - diluted | $ / shares |  |  | $ 1.55 | $ 4.21 | $ 4.27 |
CSFL |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |
Cash and cash equivalents | $ 2,566,450,000 |  |  |  |  |
Investment securities | 1,193,910,000 |  |  |  |  |
Loans held for sale | 453,578,000 |  |  |  |  |
Loans, net of allowance and mark | 12,950,583,000 |  |  |  |  |
Premises and equipment | 332,787,000 |  |  |  |  |
Intangible assets | 140,862,000 |  |  |  |  |
OREO and repossessed assets | 10,009,000 |  |  |  |  |
Bank owned life insurance | 333,053,000 |  |  |  |  |
Deferred tax asset. | 36,489,000 |  |  |  |  |
Other assets | 1,060,558,000 |  |  |  |  |
Total assets | 19,078,279,000 |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |
Noninterest-bearing | 5,291,443,000 |  |  |  |  |
Interest-bearing | 10,332,072,000 |  |  |  |  |
Total deposits | 15,623,515,000 |  |  |  |  |
Federal funds purchased and securities sold under agreements to repurchase | 401,546,000 |  |  |  |  |
Other borrowings | 271,499,000 |  |  |  |  |
Other liabilities | 1,083,456,000 |  |  |  |  |
Total liabilities | 17,380,016,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | 1,698,263,000 |  |  |  |  |
Goodwill | 563,625,000 | 563,600,000 |  | $ 563,600,000 |  |
Net assets acquired over liabilities assumed | $ 2,261,888,000 |  |  |  |  |
Consideration: |  |  |  |  |  |
Number of shares issued as consideration | shares | 37,271,069 |  |  |  |  |
Purchase price per share of the Company's common stock | $ / shares | $ 60.27 |  |  |  |  |
Company common stock issued ($2,246,327) and cash exchanged for fractional shares ($74) | $ 2,246,401,000 |  |  |  |  |
Stock option conversion | 8,080,000 |  |  |  |  |
Restricted stock conversion | 7,407,000 |  |  |  |  |
Value of common stock issued for fractional shares | 2,246,327,000 |  |  |  |  |
Price per fractional share | 74,000 |  |  |  |  |
Cash paid for stock options outstanding | 8,080,000 |  |  |  |  |
Fair value of total consideration transferred | 2,261,888,000 |  |  |  |  |
Merger-related charges/costs |  | 21,600,000 | $ 0 | 65,900,000 | $ 0 |
Additional information |  |  |  |  |  |
Reversal of CSFL's existing fair value adjustments | 40,700,000 |  |  |  |  |
Adjustment to record securities at fair value (premium) | 46,200,000 |  |  |  |  |
Reclassification of securities held as HTM to AFS | 175,700,000 |  |  |  |  |
Total mark of the loan portfolio | $ 269,100,000 |  |  |  |  |
Total mark of the loan portfolio (as a percent) | 2.04% |  |  |  |  |
Credit mark of the loan portfolio | $ 259,700,000 |  |  |  |  |
Credit mark of the loan portfolio (as a percent) | 1.97% |  |  |  |  |
Reversal of CSFL's ending allowance for credit losses | $ 158,200,000 |  |  |  |  |
Fair value adjustments of allowance for credit losses | 62,600,000 |  |  |  |  |
MTM adjustment on leased assets | 4,000,000.0 |  |  |  |  |
Deminimus fixed assets written off | $ 1,600,000 |  |  |  |  |
Core deposit intangible from a third party valuation (as a percent) | 1.28 |  |  |  |  |
Core deposit intangible from a third party valuation | $ 125,900,000 |  |  |  |  |
Existing core deposit intangible from prior transactions that was reversed | 84,900,000 |  |  |  |  |
Existing goodwill from prior transactions that was reversed | 1,200,000,000 |  |  |  |  |
Reversal of prior valuation reserves | 878,000 |  |  |  |  |
New valuation reserves | $ 1,700,000 |  |  |  |  |
Deferred tax assets related to fair value adjustments with effective tax rate | 22.00% |  |  |  |  |
Fair value adjustment of bank property held for sale | $ 3,800,000 |  |  |  |  |
Fair value adjustment of lease receivable | 116,000 |  |  |  |  |
Fair value negative adjustment for investment in low income housing | 3,300,000 |  |  |  |  |
Estimated premium for fixed maturity time deposits | 20,200,000 |  |  |  |  |
Reversal of existing CSFL fair value adjustments related to time deposit marks from other merger transactions | 546,000 |  |  |  |  |
Discount on TRUPs from a third party valuation | 12,500,000 |  |  |  |  |
Reversal of the existing CSFL discount on TRUPs and other debt | 5,100,000 |  |  |  |  |
Reversal of an existing unfunded commitment reserve at purchase date | 7,100,000 |  |  |  |  |
Fair value adjustment to increase lease liabilities associated with rental facilities | 2,500,000 |  |  |  |  |
Merger-related charges/costs |  | 21,600,000 | $ 0 | 65,900,000 | $ 0 |
Provision for loan losses |  |  |  |  |  | 3,800,000
Provisional income tax expense |  |  |  |  |  | $ 119,100,000
CSFL | As Recorded by CSFL |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |
Cash and cash equivalents | 2,566,450,000 |  |  |  |  |
Investment securities | 1,188,403,000 |  |  |  |  |
Loans held for sale | 453,578,000 |  |  |  |  |
Loans, net of allowance and mark | 12,969,091,000 |  |  |  |  |
Premises and equipment | 324,396,000 |  |  |  |  |
Intangible assets | 1,294,211,000 |  |  |  |  |
OREO and repossessed assets | 10,849,000 |  |  |  |  |
Bank owned life insurance | 333,053,000 |  |  |  |  |
Deferred tax asset. | 54,122,000 |  |  |  |  |
Other assets | 1,061,136,000 |  |  |  |  |
Total assets | 20,255,289,000 |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |
Noninterest-bearing | 5,291,443,000 |  |  |  |  |
Interest-bearing | 10,312,370,000 |  |  |  |  |
Total deposits | 15,603,813,000 |  |  |  |  |
Federal funds purchased and securities sold under agreements to repurchase | 401,546,000 |  |  |  |  |
Other borrowings | 278,900,000 |  |  |  |  |
Other liabilities | 1,088,048,000 |  |  |  |  |
Total liabilities | 17,372,307,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | 2,882,982,000 |  |  |  |  |
Net assets acquired over liabilities assumed | 2,882,982,000 |  |  |  |  |
CSFL | Initial Fair Value Adjustments |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |
Investment securities | 5,507,000 |  |  |  |  |
Loans, net of allowance and mark | (48,342,000) |  |  |  |  |
Premises and equipment | 2,392,000 |  |  |  |  |
Intangible assets | (1,163,349,000) |  |  |  |  |
OREO and repossessed assets | (791,000) |  |  |  |  |
Deferred tax asset. | (8,681,000) |  |  |  |  |
Other assets | (604,000) |  |  |  |  |
Total assets | (1,213,868,000) |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |
Interest-bearing | 19,702,000 |  |  |  |  |
Total deposits | 19,702,000 |  |  |  |  |
Other borrowings | (7,401,000) |  |  |  |  |
Other liabilities | (4,592,000) |  |  |  |  |
Total liabilities | 7,709,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | (1,221,577,000) |  |  |  |  |
Goodwill | 600,483,000 |  |  |  |  |
Net assets acquired over liabilities assumed | (621,094,000) |  |  |  |  |
CSFL | Subsequent Fair Value Adjustments |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |
Loans, net of allowance and mark | 29,834,000 |  |  |  |  |
Premises and equipment | 5,999,000 |  |  |  |  |
Intangible assets | 10,000,000 | 10,000,000.0 |  | 10,000,000.0 |  |
OREO and repossessed assets | (49,000) |  |  |  |  |
Deferred tax asset. | (8,952,000) |  |  |  |  |
Other assets | 26,000 |  |  |  |  |
Total assets | 36,858,000 |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | 36,858,000 |  |  |  |  |
Goodwill | $ (36,858,000) | $ (36,900,000) |  | $ (36,900,000) |  |
CSFL | Subsequent Fair Value Adjustments |  |  |  |  |  |
Additional information |  |  |  |  |  |
Deferred tax assets related to fair value adjustments with effective tax rate | 23.78% |  |  |  |  |

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